<template>
    <!-- 底部 -->
    <div class="my-footer">
        <!-- 全选 -->
        <div class="custom-control custom-checkbox">
            <input type="checkbox" class="custom-control-input" id="footerCheck" v-model="allSelect">
            <label class="custom-control-label" for="footerCheck">全选</label>
        </div>
        <!-- 合计 -->
        <div>
            <span>合计:</span>
            <span class="price">¥ {{ totalPrice }}</span>
        </div>
        <!-- 按钮 -->
        <button type="button" class="footer-btn btn btn-primary">结算 ( {{ totalCount }} )</button>
    </div>
</template>

<script>
export default {
    props: ['list'],
    computed: {
        allSelect: {
            get() {
                return this.list.every(item => item.goods_state)
            },
            set(val) {
                this.list.forEach(item => item.goods_state = val)
            }
        },
        totalCount() {
            return this.list
                .filter(item => item.goods_state)
                .reduce((prev, item) => prev + item.goods_count, 0)
        },
        totalPrice() {
            return this.list
                .filter(item => item.goods_state)
                .reduce((prev, item) => prev + item.goods_count * item.goods_price, 0)
        },
    }
}
</script>

<style lang="less" scoped>
.my-footer {
  position: fixed;
  z-index: 2;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 10px;
  background: #fff;

  .price {
    color: red;
    font-weight: bold;
    font-size: 15px;
  }

  .footer-btn {
    min-width: 80px;
    height: 30px;
    line-height: 30px;
    border-radius: 25px;
    padding: 0;
  }
}
</style>
